1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2000-2010
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
6 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
7 * Andreas Heppel <aheppel@sysgo.de>
11 #include <bootstage.h>
14 #include <env_internal.h>
17 #include <asm/global_data.h>
18 #include <linux/stddef.h>
22 #include <u-boot/crc.h>
23 #include <dm/ofnode.h>
27 DECLARE_GLOBAL_DATA_PTR;
29 /************************************************************************
30 * Default settings to be used when no valid environment is found
32 #include <env_default.h>
34 struct hsearch_data env_htab = {
35 .change_ok = env_flags_validate,
39 * This env_set() function is defined in cmd/nvedit.c, since it calls
40 * _do_env_set(), whis is a static function in that file.
42 * int env_set(const char *varname, const char *varvalue);
46 * Set an environment variable to an integer value
48 * @param varname Environment variable to set
49 * @param value Value to set it to
50 * @return 0 if ok, 1 on error
52 int env_set_ulong(const char *varname, ulong value)
54 /* TODO: this should be unsigned */
55 char *str = simple_itoa(value);
57 return env_set(varname, str);
61 * Set an environment variable to an value in hex
63 * @param varname Environment variable to set
64 * @param value Value to set it to
65 * @return 0 if ok, 1 on error
67 int env_set_hex(const char *varname, ulong value)
71 sprintf(str, "%lx", value);
72 return env_set(varname, str);
75 ulong env_get_hex(const char *varname, ulong default_val)
83 value = hextoul(s, &endp);
90 int eth_env_get_enetaddr(const char *name, uint8_t *enetaddr)
92 string_to_enetaddr(env_get(name), enetaddr);
93 return is_valid_ethaddr(enetaddr);
96 int eth_env_set_enetaddr(const char *name, const uint8_t *enetaddr)
98 char buf[ARP_HLEN_ASCII + 1];
100 if (eth_env_get_enetaddr(name, (uint8_t *)buf))
103 sprintf(buf, "%pM", enetaddr);
105 return env_set(name, buf);
109 * Look up variable from environment,
110 * return address of storage for that variable,
111 * or NULL if not found
113 char *env_get(const char *name)
115 if (gd->flags & GD_FLG_ENV_READY) { /* after import into hashtable */
116 struct env_entry e, *ep;
122 hsearch_r(e, ENV_FIND, &ep, &env_htab, 0);
124 return ep ? ep->data : NULL;
127 /* restricted capabilities before import */
128 if (env_get_f(name, (char *)(gd->env_buf), sizeof(gd->env_buf)) > 0)
129 return (char *)(gd->env_buf);
135 * Like env_get, but prints an error if envvar isn't defined in the
136 * environment. It always returns what env_get does, so it can be used in
137 * place of env_get without changing error handling otherwise.
139 char *from_env(const char *envvar)
143 ret = env_get(envvar);
146 printf("missing environment variable: %s\n", envvar);
152 * Look up variable from environment for restricted C runtime env.
154 int env_get_f(const char *name, char *buf, unsigned len)
156 const char *env, *p, *end;
159 if (name == NULL || *name == '\0')
162 name_len = strlen(name);
164 if (gd->env_valid == ENV_INVALID)
165 env = default_environment;
167 env = (const char *)gd->env_addr;
169 for (p = env; *p != '\0'; p = end + 1) {
173 for (end = p; *end != '\0'; ++end)
174 if (end - env >= CONFIG_ENV_SIZE)
177 if (strncmp(name, p, name_len) || p[name_len] != '=')
179 value = &p[name_len + 1];
182 memcpy(buf, value, min(len, res + 1));
186 printf("env_buf [%u bytes] too small for value of \"%s\"\n",
197 * Decode the integer value of an environment variable and return it.
199 * @param name Name of environment variable
200 * @param base Number base to use (normally 10, or 16 for hex)
201 * @param default_val Default value to return if the variable is not
203 * @return the decoded value, or default_val if not found
205 ulong env_get_ulong(const char *name, int base, ulong default_val)
208 * We can use env_get() here, even before relocation, since the
209 * environment variable value is an integer and thus short.
211 const char *str = env_get(name);
213 return str ? simple_strtoul(str, NULL, base) : default_val;
217 * Read an environment variable as a boolean
218 * Return -1 if variable does not exist (default to true)
220 int env_get_yesno(const char *var)
222 char *s = env_get(var);
226 return (*s == '1' || *s == 'y' || *s == 'Y' || *s == 't' || *s == 'T') ?
231 * Look up the variable from the default environment
233 char *env_get_default(const char *name)
236 unsigned long really_valid = gd->env_valid;
237 unsigned long real_gd_flags = gd->flags;
239 /* Pretend that the image is bad. */
240 gd->flags &= ~GD_FLG_ENV_READY;
241 gd->env_valid = ENV_INVALID;
242 ret_val = env_get(name);
243 gd->env_valid = really_valid;
244 gd->flags = real_gd_flags;
248 void env_set_default(const char *s, int flags)
251 if ((flags & H_INTERACTIVE) == 0) {
252 printf("*** Warning - %s, "
253 "using default environment\n\n", s);
258 debug("Using default environment\n");
262 if (himport_r(&env_htab, default_environment,
263 sizeof(default_environment), '\0', flags, 0,
265 pr_err("## Error: Environment import failed: errno = %d\n",
268 gd->flags |= GD_FLG_ENV_READY;
269 gd->flags |= GD_FLG_ENV_DEFAULT;
273 /* [re]set individual variables to their value in the default environment */
274 int env_set_default_vars(int nvars, char * const vars[], int flags)
277 * Special use-case: import from default environment
278 * (and use \0 as a separator)
280 flags |= H_NOCLEAR | H_DEFAULT;
281 return himport_r(&env_htab, default_environment,
282 sizeof(default_environment), '\0',
283 flags, 0, nvars, vars);
287 * Check if CRC is valid and (if yes) import the environment.
288 * Note that "buf" may or may not be aligned.
290 int env_import(const char *buf, int check, int flags)
292 env_t *ep = (env_t *)buf;
297 memcpy(&crc, &ep->crc, sizeof(crc));
299 if (crc32(0, ep->data, ENV_SIZE) != crc) {
300 env_set_default("bad CRC", 0);
301 return -ENOMSG; /* needed for env_load() */
305 if (himport_r(&env_htab, (char *)ep->data, ENV_SIZE, '\0', flags, 0,
307 gd->flags |= GD_FLG_ENV_READY;
311 pr_err("Cannot import environment: errno = %d\n", errno);
313 env_set_default("import failed", 0);
318 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
319 static unsigned char env_flags;
321 int env_check_redund(const char *buf1, int buf1_read_fail,
322 const char *buf2, int buf2_read_fail)
324 int crc1_ok = 0, crc2_ok = 0;
325 env_t *tmp_env1, *tmp_env2;
327 tmp_env1 = (env_t *)buf1;
328 tmp_env2 = (env_t *)buf2;
330 if (buf1_read_fail && buf2_read_fail) {
331 puts("*** Error - No Valid Environment Area found\n");
333 } else if (buf1_read_fail || buf2_read_fail) {
334 puts("*** Warning - some problems detected ");
335 puts("reading environment; recovered successfully\n");
339 crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) ==
342 crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) ==
345 if (!crc1_ok && !crc2_ok) {
346 return -ENOMSG; /* needed for env_load() */
347 } else if (crc1_ok && !crc2_ok) {
348 gd->env_valid = ENV_VALID;
349 } else if (!crc1_ok && crc2_ok) {
350 gd->env_valid = ENV_REDUND;
352 /* both ok - check serial */
353 if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
354 gd->env_valid = ENV_REDUND;
355 else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
356 gd->env_valid = ENV_VALID;
357 else if (tmp_env1->flags > tmp_env2->flags)
358 gd->env_valid = ENV_VALID;
359 else if (tmp_env2->flags > tmp_env1->flags)
360 gd->env_valid = ENV_REDUND;
361 else /* flags are equal - almost impossible */
362 gd->env_valid = ENV_VALID;
368 int env_import_redund(const char *buf1, int buf1_read_fail,
369 const char *buf2, int buf2_read_fail,
375 ret = env_check_redund(buf1, buf1_read_fail, buf2, buf2_read_fail);
378 env_set_default("bad env area", 0);
380 } else if (ret == -ENOMSG) {
381 env_set_default("bad CRC", 0);
385 if (gd->env_valid == ENV_VALID)
390 env_flags = ep->flags;
392 return env_import((char *)ep, 0, flags);
394 #endif /* CONFIG_SYS_REDUNDAND_ENVIRONMENT */
396 /* Export the environment and generate CRC for it. */
397 int env_export(env_t *env_out)
402 res = (char *)env_out->data;
403 len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
405 pr_err("Cannot export environment: errno = %d\n", errno);
409 env_out->crc = crc32(0, env_out->data, ENV_SIZE);
411 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
412 env_out->flags = ++env_flags; /* increase the serial */
418 void env_relocate(void)
420 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
423 env_htab.change_ok += gd->reloc_off;
425 if (gd->env_valid == ENV_INVALID) {
426 #if defined(CONFIG_ENV_IS_NOWHERE) || defined(CONFIG_SPL_BUILD)
427 /* Environment not changable */
428 env_set_default(NULL, 0);
430 bootstage_error(BOOTSTAGE_ID_NET_CHECKSUM);
431 env_set_default("bad CRC", 0);
438 #ifdef CONFIG_AUTO_COMPLETE
439 int env_complete(char *var, int maxv, char *cmdv[], int bufsz, char *buf,
442 struct env_entry *match;
447 * When doing $ completion, the first character should
448 * obviously be a '$'.
456 * The second one, if present, should be a '{', as some
457 * configuration of the u-boot shell expand ${var} but not
462 else if (var[0] != '\0')
471 while ((idx = hmatch_r(var, idx, &match, &env_htab))) {
472 int vallen = strlen(match->key) + 1;
474 if (found >= maxv - 2 ||
475 bufsz < vallen + (dollar_comp ? 3 : 0))
480 /* Add the '${' prefix to each var when doing $ completion. */
487 memcpy(buf, match->key, vallen);
493 * This one is a bit odd: vallen already contains the
494 * '\0' character but we need to add the '}' suffix,
495 * hence the buf - 1 here. strcpy() will add the '\0'
496 * character just after '}'. buf is then incremented
497 * to account for the extra '}' we just added.
499 strcpy(buf - 1, "}");
504 qsort(cmdv, found, sizeof(cmdv[0]), strcmp_compar);
507 cmdv[found++] = dollar_comp ? "${...}" : "...";
514 #ifdef CONFIG_ENV_IMPORT_FDT
515 void env_import_fdt(void)
522 path = env_get("env_fdt_path");
523 if (!path || !path[0])
526 node = ofnode_path(path);
527 if (!ofnode_valid(node)) {
528 printf("Warning: device tree node '%s' not found\n", path);
532 for (res = ofnode_get_first_property(node, &prop);
534 res = ofnode_get_next_property(&prop)) {
535 const char *name, *val;
537 val = ofnode_get_property_by_prop(&prop, &name, NULL);